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Corrosion Source - Corrosion glossary
Category: General technical and industrial > Corrosion
Date & country: 11/12/2007, UK
Words: 620


uniform corrosion
(1) A type of corrosion attack (deterioration) uniformly distributed over metal surface. (2) Corrosion that proceeds at approximately the same rate over a metal surface. Also called general corrosion.

vacuum deposition
Condensation of thin metal coatings on the cool surface of work in vacuum.

valence
A positive number that characterizes the combining power of an element for other elements, as measured by the number of bonds to other atoms that one atom of the given element forms upon chemical combination: hydrogen is assigned valence 1, and the valence is the number of hydrogen atoms, or their equivalent, with which an atom of the given element…

vapor deposition
See chemical vapor deposition, physical vapor deposition and sputtering.

vapor plating
Deposition of a metal or compound on a heated surface by reduction or decomposition of a volatile compound at a temperature below the melting points of the deposit and the base material. The reduction is usually accomplished by a gaseous reducing agent such as hydrogen. The decomposition process may involve thermal dissociation or reaction with the…

voids
A term generally applied to paints to describe holidays, holes, and skips in a film. Also used to describe shrinkage in castings and weld.

wash primer
A thin, inhibiting paint, usually chromate pigmented with a polyvinyl butyrate binder.

weld cracking
Cracking that occurs in the weld metal. See also cold cracking, hot cracking, lamellar tearing, and stress-relief cracking.

weld decay
Intergranular corrosion, usually of stainless steels or certain nickel-base alloys, that occurs as the result of sensitization in the heat-affected zone during the welding operation.

wetting
A condition in which the interfacial tension between a liquid and a solid is such that the contact angle is 0º to 90º.

wetting agent
A substance that reduces the surface tension of a liquid, thereby causing it to spread more readily on a solid surface.

white liquor
Cooking liquor from the kraft pulping process produced by recausticizing green liquor with lime.

white rust
Zinc oxide: the powdery product of corrosion of zinc or zinc-coated surfaces.

work hardening
Same as strain hardening.

working electrode
The test or specimen electrode in an electrochemical cell.

yield
Evidence of plastic deformation in structural materials. Also called plastic flow or creep. See also flow.

yield point
The first stress in a material, usually less than the maximum attainable stress, at which an increase in strain occurs without an increase in stress. Only certain metals - those that exhibit a localized, heterogeneous type of transition from elastic deformation to plastic deformation - produce a yield point. If there is a decrease in stress after y…

yield strength
The stress at which a material exhibits a specified deviation from proportionality of stress and strain. An onset of 0.2% is used for many metals.

yield stress
The stress level in a material at or above the yield strength but below the ultimate strength, i.e., a stress in the plastic range.

zeta potential
See electrokinetic potential.